Retrieving "Vapor Barrier" from the archives

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1. Yurt

   Linked via "Vapor barrier"

   | Layer | Primary Material Composition | Function | Typical Thickness (cm) |
   | :--- | :--- | :--- | :--- |
   | Inner Liner | Fine Merino wool, treated with birch sap | Vapor barrier and thermal regulation | $0.5$ |
   | Main Insulation | Medium-grade sheep's wool, sun-dried | Thermal mass and structural cushioning | $3.0 - 4.5$ |
   | Outer Shell | Heavily compressed coarse wool (yak/[ca…